1. Used abroad:Used in , computer wire , data wire , high frequence wire hseat extrusion. 用途广：适用于电源线，计算机线，数据线，高频线外被护套押出。
2. I am a man easily touched. I am often weepy when reading. It is a frequence to weep. After all I am a man. 我是一个容易被感动的人，经常看书时感觉眼睛很难受，哭出来倒很少有，毕竟我还是一个男生。
3. In view of the impact of time delay in medium frequence inverter, this paper introduces a dual loop control system based on state-observer. 针对时间延迟对中频逆变器性能的影响，提出了一种基于状态观测器的双环控制方案，并在双环之外加入重复控制器。
英英解释
n.
1. the number of occurrences within a given time period
